Mgaincrest, or Mountain Cleaver

The sword was forged by the heart of the mountain.  Not in it, but by it.  Using the bowels of the earth as its forge and the root of the mountain as its anvil, the Galestorm, the mountain enshrouded in wind and rain, poured forth all of its power and strength into the blade.  For years, the mountain hammered the finest of edges onto the blade, while tempering it with molten fire.  Thus was Mgaincrest, or Mountain Cleaver, forged. 
The blade seems weak and poorly wrought, being forged by the unskilled hand of a mountain, but the materials from which it was made surpass that which could be used by even the greatest of craftsmen.  Appearing in the nature of tarnished bronze embedded with diamonds, it bears the strength of a thousand diamonds and a truer edge than any ever made.  It could slice through steel, like a knife through the air, without leaving a blemish on the edge.
Few know when it was forged, or how long it sleeps in the mountain before the dwarves discovered it.  It was found in a great chasm, near the heart of the mountain.  It rested gloriously atop a stone pillar, cleaving the rock to hold itself upright. 
The dwarves had come in search of precious metals, but had found none.  On the verge of abandoning the mines, they stumbled across the chasm.  Seeing the sword, their hope was restored, only to be short lived.  The mountain had spent all of its wealth to forge the sword and nothing remained to be taken by the dwarves.  Though they searched the endless passages and crevases tirelessly, they found not a trace of metal or jewel.
The dwarves, in their frustration, attempted to take the sword.  But the mountain refused to give up its prize.  The rocks held the blade firmly in their grasp.  When the dwarves attempted to topple the pillar on which the blade sat, the mountain grew angry.  It started to cast down stones at the dwarves, driving them from the chasm.  The dwarves, afraid for their lives, fleed the mountain.  Leaving behind their tunnels and passages, the dwarves left, and never spoke of the chasm or sword again.
The path to the sword thus became opened and ungaurded, with the exception of the mountain.